Forming and balancing millstones



E. MUNSON.

Balancing Millstones.

No. 6.639. Patented Aug. 7, 1849.

UNITED STATES PATENT OFFICE.

EDMUND MUNSON, OF UTICA, NEW YORK.

FORMING AND BALANCING MILLSTONES.

Specification of Letters Patent No. 6,639, dated August 7, 1849;

T 0 all whom it may concern:

Be it known that I, EDMUND MUNsoN, of

new and Improved Mode of Balacing and Finishing Millstones; and I dohereby declare that the following is a full and exact description.

The nature of my invention consists in the construction of a machine orapparatus on which the millstone after it is blocked up is suspendedupon its center and in balancing it there in the course of filling upand finishing, instead of filling up the same without the means oftesting the accuracy of its balance, leaving that to be done by the1nillwright (as is usually the case) in hanging the stone for actual usein the mill.

To enable others skilled in the art to make and use my invention, I willproceed to describe my apparatus, and the manner of finishing andbalancing the millstone thereon, reference being had to the annexeddrawings, making a part of this specification.

Figure 1 represents a millstone in which the blocks forming its face andeye are put together and cemented in the usual manner. The stone is hereleft in the state where my process of balancing in connection with thefurther finishing of the stone commences. The upper surface of the stoneis here left quite uneven with a encle hole for the eye in the center atf.

Fig. 2 represents a quadrangular frame a, Z), G with the necessaryapparatus on which the millstone is to be raised and poised forfinishing.

Figs. 3, 4 and 5 are movable parts of this machine which are here shownseparately, but which are added to Fig. 2 before putting the millstonethereon.

. Fig. 6 is identical with the ring a, b, and pivot or cockhead C (Fig.2) with the cap C (Fig. 4) placed upon it. This cap is a hollow coneclosed at the top and is suspended loosely on the pivot or cockhead(Fig. 2) in sucha manner as to rest on the top of the pivot. This isshown at C (Fig. 6). The ring a, b (Fig. 2), has four friction rollerse, e, e, 6, set in its upper surface, which project slightly above thesurface. These are also seen at e, e, e, 6 (Fig. 6).

Fig. 3 is a circular plate designed as the base or platform on which thestone is to rest, when suspended on the machine. The

underside of this circular plate or platform is here shown, the oppositeside on which the stone is to rest is perfectly plane and level. It hastwo projecting circular collars 0 and d cast upon it. The inner circle aincloses the eyeor aperture (4 and is of just sufficient compass toinclose the driver f (Fig. 6), the notches e, e (Fig. 3), embracing theears 7c, is (Fig. 6). The circular driver f (Fig. 2) is fitted and keyedto the spindle a, (Z, so that when the platform A, A (Fig. 3), is placedupon it as above described, and the spindle or cockhead C (Fig. 2) isturned, it carries the platform with it and consequently the stone also,if laid upon it. The collar d (Fig. 3) of the platform, is justsuflicient in compass to rest on the friction rollers e, e, e, 6 (Fig.2), so that when the platform A, A (Fig. 3), is turned over from theposition there shown, and laid on the circular frame a, b (Fig. 2), itrests on these friction rollers, and also on the cockhead or spindle Gby the use of the cap C (Fig. 4:) as before described. The spindle 0, (Z(Fig. 2), is movable in a vertical direction by the use of the commonlighter screw m raising and lowering the bridge tree 0, P, on Which thespindle 0, (Z, stands. By this means the platform A, A (Fig. 3), whenplaced on the machine, as before described, may be raised from thefriction rollers and held suspended on the cockhead C alone; or it mayhe suffered to rest entirely on the friction rollers by lowering thespindles or cockhead in the same manner.

The cap C (Fig. 4) being placed upon the spindle or cockhead C (Fig. 2),and the platform A, A (Fig. 3), also being laid on as described, thehollow cone A (Fig. 5), which is designed to form the eye of themillstone is then set on the top of the platform,-over the cap C, andthe unfinished millstone'S, S (Fig. 1), is then raised by the use of acommon crane, and is set upon and adjusted to the plat-form. Theappearance then exhibited by the machine with the millstone upon it isshown in Fig. 7 where the cone A (Fig. 5), is seen protruding throughthe eye of the stone at h- (Fig. 7), and the iron band f, s, is added.Previous to this band being put upon the stone, and after the latter isplaced upon the machine, the skirt of the stone having been coated overwith plaster, the platform and the stone thereon, are set in motion bythe application of motive power to the pulley P, and the skirt of thestone is here turned off perfectly true. It is then ready to receive theband. This band is wide and extends above the edge of the stone in itsunfinished state, showing the usual vacancy between the eye it, and theband, which is to be filled up in the finishing. It is in this fillingup and finishing of the stone that the balancing of it is performed. Themeans being here afforded as described of raising the stone free fromthe friction rollers and holding it, through the agency of the cap C(Fig. 4), suspended on the spindle or cockhead C (Fig. 2), and in thatcondition observing its balance when at rest; or by the application ofmotive power to the pulley P (Fig. 7), of communicating to the stone aswift motion and in that condition of observing its balance, it can veryaccurately be ascertained which side of the stone preponderates andwhere to apply the heaviest filling. This test may be resorted to fromtime to time as the filling up and finishing the millstone progresses.When the filling is completed the stone is again set in mot-ion and thetop is nicely turned off and the stone is complete, while during thewhole process the means are afforded of testing its balance both at restand in motion so that when the favorable to the perfection of the stoneand with great savin of labor over the modes of finishing now 1n use,but the stone is also thoroughly balanced and ready for use.

What I claim as my invention, and desire to secure by Letters Patentis 1. The mode herein described of testing and balancing millstones, bybeing enabled by the means here described to observe the balance of thestone while the same is in motion as well as at rest, and at the sametime to correct the inaccuracies of its balance during the progress ofconstruction.

2. I also claim the use of the machine here described for'turning offthe exterior of the millstone in finishing the same as herein mentioned,in combination with the use of the same machine in testing the balanceof the stone as above set forth.

The whole being arranged and combined substantially as herein set forthand described.

EDMUND MUN SON. Witnesses:

WM. BAKER, RUFUS C. BAKER.

